From f281233d3eba15fb225d21ae2e228fd4553d824a Mon Sep 17 00:00:00 2001 From: Jeff Garzik Date: Tue, 16 Nov 2010 02:10:29 -0500 Subject: SCSI host lock push-down Move the mid-layer's ->queuecommand() invocation from being locked with the host lock to being unlocked to facilitate speeding up the critical path for drivers who don't need this lock taken anyway. The patch below presents a simple SCSI host lock push-down as an equivalent transformation. No locking or other behavior should change with this patch. All existing bugs and locking orders are preserved. Additionally, add one parameter to queuecommand, struct Scsi_Host * and remove one parameter from queuecommand, void (*done)(struct scsi_cmnd *) Scsi_Host* is a convenient pointer that most host drivers need anyway, and 'done' is redundant to struct scsi_cmnd->scsi_done. Minimal code disturbance was attempted with this change. Most drivers needed only two one-line modifications for their host lock push-down. Signed-off-by: Jeff Garzik Acked-by: James Bottomley Signed-off-by: Linus Torvalds --- drivers/message/fusion/mptfc.c | 7 ++++--- drivers/message/fusion/mptsas.c | 4 +++- drivers/message/fusion/mptspi.c | 4 +++- drivers/message/i2o/i2o_scsi.c | 6 ++++-- 4 files changed, 14 insertions(+), 7 deletions(-) (limited to 'drivers/message') diff --git a/drivers/message/fusion/mptfc.c b/drivers/message/fusion/mptfc.c index e15220ff52f..d784c36707c 100644 --- a/drivers/message/fusion/mptfc.c +++ b/drivers/message/fusion/mptfc.c @@ -97,8 +97,7 @@ static u8 mptfcInternalCtx = MPT_MAX_PROTOCOL_DRIVERS; static int mptfc_target_alloc(struct scsi_target *starget); static int mptfc_slave_alloc(struct scsi_device *sdev); -static int mptfc_qcmd(struct scsi_cmnd *SCpnt, - void (*done)(struct scsi_cmnd *)); +static int mptfc_qcmd(struct Scsi_Host *shost, struct scsi_cmnd *SCpnt); static void mptfc_target_destroy(struct scsi_target *starget); static void mptfc_set_rport_loss_tmo(struct fc_rport *rport, uint32_t timeout); static void __devexit mptfc_remove(struct pci_dev *pdev); @@ -650,7 +649,7 @@ mptfc_slave_alloc(struct scsi_device *sdev) } static int -mptfc_qcmd(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *)) +mptfc_qcmd_lck(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *)) { struct mptfc_rport_info *ri; struct fc_rport *rport = starget_to_rport(scsi_target(SCpnt->device)); @@ -681,6 +680,8 @@ mptfc_qcmd(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *)) return mptscsih_qcmd(SCpnt,done); } +static DEF_SCSI_QCMD(mptfc_qcmd) + /* * mptfc_display_port_link_speed - displaying link speed * @ioc: Pointer to MPT_ADAPTER structure diff --git a/drivers/message/fusion/mptsas.c b/drivers/message/fusion/mptsas.c index 83a5115f025..d48c2c6058e 100644 --- a/drivers/message/fusion/mptsas.c +++ b/drivers/message/fusion/mptsas.c @@ -1889,7 +1889,7 @@ mptsas_slave_alloc(struct scsi_device *sdev) } static int -mptsas_qcmd(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *)) +mptsas_qcmd_lck(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *)) { MPT_SCSI_HOST *hd; MPT_ADAPTER *ioc; @@ -1913,6 +1913,8 @@ mptsas_qcmd(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *)) return mptscsih_qcmd(SCpnt,done); } +static DEF_SCSI_QCMD(mptsas_qcmd) + /** * mptsas_mptsas_eh_timed_out - resets the scsi_cmnd timeout * if the device under question is currently in the diff --git a/drivers/message/fusion/mptspi.c b/drivers/message/fusion/mptspi.c index 0e2803155ae..6d9568d2ec5 100644 --- a/drivers/message/fusion/mptspi.c +++ b/drivers/message/fusion/mptspi.c @@ -780,7 +780,7 @@ static int mptspi_slave_configure(struct scsi_device *sdev) } static int -mptspi_qcmd(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *)) +mptspi_qcmd_lck(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *)) { struct _MPT_SCSI_HOST *hd = shost_priv(SCpnt->device->host); VirtDevice *vdevice = SCpnt->device->hostdata; @@ -805,6 +805,8 @@ mptspi_qcmd(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *)) return mptscsih_qcmd(SCpnt,done); } +static DEF_SCSI_QCMD(mptspi_qcmd) + static void mptspi_slave_destroy(struct scsi_device *sdev) { struct scsi_target *starget = scsi_target(sdev); diff --git a/drivers/message/i2o/i2o_scsi.c b/drivers/message/i2o/i2o_scsi.c index ea6b2197da8..97bdf82ec90 100644 --- a/drivers/message/i2o/i2o_scsi.c +++ b/drivers/message/i2o/i2o_scsi.c @@ -506,7 +506,7 @@ static struct i2o_driver i2o_scsi_driver = { * Locks: takes the controller lock on error path only */ -static int i2o_scsi_queuecommand(struct scsi_cmnd *SCpnt, +static int i2o_scsi_queuecommand_lck(struct scsi_cmnd *SCpnt, void (*done) (struct scsi_cmnd *)) { struct i2o_controller *c; @@ -688,7 +688,9 @@ static int i2o_scsi_queuecommand(struct scsi_cmnd *SCpnt, exit: return rc; -}; +} + +static DEF_SCSI_QCMD(i2o_scsi_queuecommand) /** * i2o_scsi_abort - abort a running command -- cgit v1.2.3